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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76a44ff1e3edec56b7780e7473969685e9accc73e259bc5037a54bd1b568082' 
  AND token = 'uH+Kl53rxz0W7zcK+odWM6oh0RHjWgdfQ4bj1QbrOHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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