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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86327650aa1c3b65af9e2ecbe8ab9a91cda35bca76fc88611fe0ed6275a7aee' 
  AND token = 'Sp0lcPEjDQTF/Pq4u6/DO8dSNm65X8hLjAquCIQAHtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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