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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014528c1b9038657343f98e265ff41262bdf34c899f592a41027e9a039d35db9' 
  AND token = 'Kcq7Qw2VOcefn7B2p6gqN0CNpHBR9S/61+F1Z4bxqCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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