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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4478c52c23fa868d31e568af871fdf0d7cd59a98111c5313f7e4335d77a5a86' 
  AND token = 'Iu6CRy878AC809+xWGvNc/2YunEXBhAO3VPSMSyKXqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}