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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd43cc181d5b90b21d5379eb497f3b9249774598d5ef74cb7732eecdabbd81a' 
  AND token = '1wruOxEMbpLOzLLLm8iC8A+Qny0JuvHmEEdtqjyg+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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