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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cef5204ca0b7618fc9b91e6777b8bc8f50bc208cded01a9c1c519431aa8c04d' 
  AND token = 'eQ0zisxqf5HwVwL0n85NM3MmFagNc0v5aUGdrh+AYcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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