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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02a0c1e7cd871f27ea928f0b46f3546e206956ce739b705aa9513e4e2638835' 
  AND token = 'GQNTj0cQ6SQnZCd2+JhDQOZ2rm8TxUVDWxZ4Xjchnsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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