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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7823ed0f4a75e5c32ad8af9fb49f650b0da5cc52c73cf42b313977fe903a1dd6' 
  AND token = '8xT0jDpegRiHHH5M8YLztSWuU18NYKIsh3I4ZymOZfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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