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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5984981ee6507984db3b737090c70d20114291c2b6b47ae7e0ec71bec33f31' 
  AND token = 'XxsVDmmGIQ74w4OzLerfuLIY8FPO8gb7HMpG/B9nArA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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