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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcaa7a15c3079b66afefa9188a2321afaab8165e730b45061f921e373077832c' 
  AND token = 'ZWvj5iNvUeL8EnFJ1DSQf9V3i3BdPWG6OWSqeORbSlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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