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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733c4e11b2adfc4895e65f2ac5d03bde3f403b9fb6c286ecdf0fb23673b596c6' 
  AND token = 'Z/XYq5vokvfB29RCGGkbCTYEzjEhUba/74lxjzIOs5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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