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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257bcfd7e172882ea62443365b23e2997ecc0614dab42377a4917b3bca3d9026' 
  AND token = 'ByIg4kR6H6+FcDhEIsQ8G++xe/FnNbtF5UU/Y01vG50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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