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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcc21691d2e4406f9f6abf04cf6198f1549292f5a65f6735d192d11249aa4db' 
  AND token = 'oxBycYbk2k4oGX+bkeZZh5dQgg3XFid0c6dhRI+xcYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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