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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f3ba0391464aa1fce15c5d5566e08b35df9f23f34fa5170755ef9216f22801' 
  AND token = 'IbPxIhpY0P+Jn4XQUdNR9mw3fhHk00EgrlelG17TkFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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