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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a6d10ff304bc3ed58880327d176ac1b0320a4e601ea7b81d14816e698e8a7b' 
  AND token = '5z4NIrL3B9YmiILwFqOBG0wAd46IM8C3C8irwbZJbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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