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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '819440735c85af401f643635267bcdc6e1e9002e088d77fc272e17e4dda24058' 
  AND token = 'X+P6wzdE59eRmpFuIE4nm248CaCBHcA5bn7ShG+ywHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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