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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a367b3b704a62a8fbcc998c9149696836af742dc852c98ceec5bd99f86e03ed5' 
  AND token = 'kfQu5nzOwI48hSp9JqeygigfUAnycHEO/1+HT7DqJtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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