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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29759b111dab6f8dad03b9fb9deb7c63ad2f89b5c7d15588ca4270b0e57e51f' 
  AND token = 'tV0ZgoSdFKh7TvzwMbZhWZQy9fTMKP5Xwo/tJsXZneA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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