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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1ac57e6b46cd1b0692d5e4e94cafc17dfca8888740f2a85127e20d1f68ab9d' 
  AND token = 'xU5LAGW0f/WGDrr0NxXewJWS5VGvlpK5Bb1bF7gJrBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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