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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1dd14269e2b8bd8a5ca411b640ef48e62b4a4e45bf99078d24d1d671e1e4d1' 
  AND token = 'gPhSrImBtfDYnuRGxiQAtqXTjIx7q4Q1fDpkk8ukcLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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