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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713becb367b02704f5f024663a71092658e68a4a6096ebf948081fd48d886e1b' 
  AND token = 'ZLn0bXmkIYf7xfbFggqvoGCn7Qw1xnHdqW5N873kOXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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