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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d43a85a57e9ad955155d1c7dc2197d262ac7460bdbe9d6138fe3a084a63b4d9' 
  AND token = 'mZwF7RBIvhId/Xd0NCC04YzmpJmzk3/h5YR3wrDLs6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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