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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9ad6cb0e9a662cb4357b6ad8bdf2b370709af867d32c0860605aa29ea568f7' 
  AND token = 'gdkmfDaNoSjpcgeDCZIpvdFwSQmGU12k0uZS2e9z5NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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