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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcddd9655a48cb4b60f7a0d8f09ce99fb09e4381adfe608a03ae0528b77a8385' 
  AND token = 'Yo4/PFt3J3ly0H96RlCxTKTHBjGJV6/JYCs+jObG8b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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