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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a4b86c98a34660f7a302571b44d6a1efdd7a35c839b8d1728ce9e79a96029f' 
  AND token = 'YfH8CAR7q9wu4qnOhyrmaVrvVwWv0tRbbMH0Lk9LH0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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