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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4824582ba386a5048f20cff01dbb4733d5bff47ba4dfd72214efdb5adc528b' 
  AND token = 'pC55zq0ANt8Oo1i+SvZdqc++q9SWsE48RQe0aPmk+XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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