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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9318a67539c49181fa96e86e6e253c4cb2e6ef3301f7e1b505745ce93d4eba2c' 
  AND token = 'tkQR6z1UHs92I2qwJDEkZYInfM3I76mhXZLARM1AoZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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