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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb49bea443af06f86ca27bcf6c10c35c0a095dc6fd6c5331b6493d9d0ad7df7d' 
  AND token = 'HZ53qcw63KjD8+9ivIMM1S/9oQSjE+U71FLNb7BxQrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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