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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece3e7af00c3efb10ae029ab2aa7c0aae158bc992d79620c8bf83897476829db' 
  AND token = '67KdJJKcNR+7sLx/zYlzX+qe4htzapuDHOfzark6rxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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