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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f35ee7d9d850a41fe7d2b4597e10f5082a79127ba679d9d0ce65ebbee07b3d30' 
  AND token = '4WjjQXlfSemuIBdMrKxt43BijeeR+NG+37AYdBZSKKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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