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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8b20a9543dfb6739b16574f01b56fbf0fa05acb7ac8671d3a51f5059f48ba3' 
  AND token = 'Mdrv5rQT6CQ6XRr+rlm1ybvQ3ytP98h770eoCCtM8+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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