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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f72b83d440a2223f8d960922b455ddac91280cec55277f622b627813bc5dbd' 
  AND token = 'ONPkgNkpSZOcEmRDx2P9Lv7Hc7GJ9TNgt4JaSn3a6is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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