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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f685b76f633035fbc5d77303a469e74bcc495202207b7c69e882b700e41a477' 
  AND token = 'aly0F0k9Az/MmvFAibqT4VKtlgx5nMoexU1tiuxylzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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