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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171a1b67705d13841900100f5145280f3b2efb146bbafad16ddd6b1f5d591ba2' 
  AND token = '1o3UuEIlxIM6ui8HxyLHf3953uLze5eZlKxnFmrEGfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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