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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138cb05d72bd259a9782490d7fefaa93317473a750c2fec07dbef3043ac626a9' 
  AND token = 'WPfOoIOWuHgZFy6O5kcjfjce1YNWpXFc0foY3JsVqAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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