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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce5abc55a067c558c8a27dd6c053e3f8bdd94a9bfdb737ba68aa4da201956cc' 
  AND token = 'QG/YVd7bcXGumbOeb7as0cL99+uEB38AcYf3pI4Lt5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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