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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e778d1c5d8465b89f7856fdf4b1fbede62af8682b880375b7c9fb969fd0736' 
  AND token = 'KsA5n6ACbypNqwZnPSV7POPLSs2l+89TBJo8bwwxc3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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