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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bffe3cd2f5dc595c2108fd45a22dc112a8e09fa9ddfa8dcd67c6fc9fd930a70e' 
  AND token = 'QDSLuDtZUVyQPnzPfxi5e0HijcdFs6ZYnnM2129jxvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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