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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb69e9fcfc2ffac162122ca7efdb91aa4f0c1036c63104892c5e87ac5a2a1c7' 
  AND token = 'svH+TXxnS4sb8mmYBdDuG7l9lzc66NEXM/1sOwuOLXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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