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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568c3a2e3eabadfa3c86fdff9acec43ab7c1e50fb51d9f6a5374d54d8bcdef46' 
  AND token = 'YEL2VgT6jo3VnOYgZFPfQIwekVxBc6qecx8KLkGwdmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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