SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f5bbf2dfe09f3bd94e4b12eeb332ca1547a35c308a2fc3d095584319977726' 
  AND token = '+g3zurL/EjFFXNziKnmh7oNB1sYc0iO67Bl40TRDQPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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