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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f04f72ca79ba6fd20a4b720545548748ffaa202a5102a9d4352baf64ed80e0c' 
  AND token = 'rYLBRS2YnRcYit2pu+ERJBu0Nib1OEj9Fmh4A3VvQA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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