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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d5ce85fba7756c9a74f0960b6bc7fd584d8f2d0e3ee79db8c2880c5812782c' 
  AND token = 'dIMu+1Bq9I8OS8ZvvTZVl7P38c7BaXiaMwwYzlTZTlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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