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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86a467f2d59bf8b5e7ec9d8826879c7c6b6ef1562efdecff3673b9e90caf883' 
  AND token = '6ru/QgC14YGx8cVax/ZCFuPDXVF0NZVKTc984awtHRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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