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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa556070fd456aed47c300484ae75216011c765ec83431f3075b7241141abef0' 
  AND token = 'zD/3r7i8EmgQt3UnY9Vq3HEFmZVLUvkejmMYlWVTvZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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