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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1625018d0d14b4c61977d041f268af56233dc766bc0cb804d2d77ea9330e11ae' 
  AND token = 'xjznQlWh731sH7WfeqLt/nD5QSlmHti5p8Cqby6LoQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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