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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ef593eba33e444bc7a12442fa56a0e7f5dc07c457ca3c1e88d462328ab9e1c' 
  AND token = 'qckSjVB5rY6ooR5OP0Wv0ISvAO5XQj9ZkdEyjaXZOeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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