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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '677b2dd93d31dadf36347b838a36fb0a88ee8f149f9b362546c59f7d564ffaac' 
  AND token = '04erybfwVme/vi6Z4OT//+LcGtlEqvuoAFNFrwZ08PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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