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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beb6c0fd90b5a596a9bc48d57b1fcfcfbc8c49a7cab0c5fc8a5496289a8f28d' 
  AND token = 'F/ldRU6aB9Cj5VPie5OIFz+xBso2HKgSr98e5fkcT4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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