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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76954113131e9b49bb9e2f76bd65811ca9ad433e3e6b91fbc585e245bd4cb22' 
  AND token = 'Sgo4MIHbvxJ081qm1mI1iAr5e6BKyA0SPom266UVJSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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