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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950f815fb392b0375f1cb929ff5a72d7e9aaa48662c1bd02b7e60060092d5d55' 
  AND token = 'yZIMX7jIB5IgXK60NIZuCxMmP57EFDuTUtAbBuIwdcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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