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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61b992b40f7b4427d99a1a96f0b7ed0bdb3116bfab7d25b3847d03961cedc3c' 
  AND token = 'LAn8yKDKb5sfZnP8c6Nc6QSCKB5h8hgY9s0KYgwnIeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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