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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017e8672aaf6a915a3bb8f9e8e49d1ce72a981e6889cf066dce583dd1b4827de' 
  AND token = 'aUgQo4ws8LNg0BNE/7cAo+GrRchHTFh/8b+oX8Zes9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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