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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8728368ac1fd9f19ca336d98c182e879fa34cf3f13284fbfff68218ce8d59dab' 
  AND token = '9BRrfGeu1dUM877PKNDDcQDNLK5SU4NEEFzPZU7bsyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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