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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f407c1ddfcb2d6663f8e22810d4fd98221efa704fa68f6ddd1512369d622e7ea' 
  AND token = 'r5XyXv3F/fykZFBRch3+fQ6Ktagt7xZJFRvVIt5FiXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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