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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23404ad6a1a4e7b57e80b38ddb807131b82c1d1d991953c2d705a23856e73b5e' 
  AND token = '2CC1ur48aiAQSpU5jGQCcXsHiJOLm5gHQGUlLX4tepg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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