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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e72e8ed24c0420236a785be96b1650ab4858f0e99254d8ab24c427f936a0ae' 
  AND token = 'XMrTtc3iIrxBic3kd9+20npWZ21VzRwIqT/J0vhyZfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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