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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9d26f840980d4b90bde2f71a4e4326067739b6ea0ef3ebda4a766a9811329d' 
  AND token = 'dyYWcb0hp9CD/WA0Prum9O32gtOGHiXxVkSmxUCAA5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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