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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe22e3ca6b440a838980cdfabee93ca746b7776b3cf8a73c4346bb91b7c1304' 
  AND token = 'qV5LF+Y49m33XxuuzVTHSywwZqwbfvm+xerZzGcmav8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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