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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c658bb6aac6577f3cbdc122a45c4345fc7599c7cbbc675896976abd135ee9a' 
  AND token = '+sY0UQwfBz4QNRH0i0zb0ze7kxjklxGPgiUaKKFBKV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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