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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb7133cbd95f7a92a915c1368dae972f446254b912b58c083f39dad635c5e2f' 
  AND token = 'j9pODyRvL9myeaWM/9k9PZYx3gX9dfwlaDED9a+khZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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