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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63365a6d684fd8f71f10bc8ba81bb81489c322ab99e20df92945681f68d646b' 
  AND token = 'p4zESPfoKScL18+jPMQW1T7k2op6QQiQMlX6TcvBOL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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